[PATCH v3 0/2] rust: transmute: implement FromBytes and AsBytes for inhabited ZSTs

Alexandre Courbot
2025-12-09T02:58:14Z

This is useful in Nova's GSP message handling, as some messages are
empty and we currently need to explicitly use an empty structure for
them.

If accepted, I would like to merge it through `drm-rust-next` so Nova
code can start using this feature quickly.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
Changes in v3:
- Use better safety statement. (thanks Gary!)
- Also add `PhantomData`. (thanks Gary!)
- Link to v2: https://patch.msgid.link/20251208-transmute_unit-v2-0-aa17a6848afb@nvidia.com

Changes in v2:
- Make use of new feature in Nova.
- Link to v1: https://patch.msgid.link/20251208-transmute_unit-v1-1-680c7386b5d9@nvidia.com

---
Alexandre Courbot (2):
rust: transmute: implement FromBytes and AsBytes for inhabited ZSTs
gpu: nova-core: gsp: use () as message type for GspInitDone message

drivers/gpu/nova-core/gsp/commands.rs | 6 +++---
rust/kernel/transmute.rs | 8 ++++++++
2 files changed, 11 insertions(+), 3 deletions(-)
---
base-commit: ba65a4e7120a616d9c592750d9147f6dcafedffa
change-id: 20251208-transmute_unit-78ab58ba9e6e

Best regards,
--
Alexandre Courbot <acourbot@nvidia.com>